Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 39 (AUTOMATIC TRANSAXLE OVERHAUL & TESTING - 4T65-E)COMPONENT DISASSEMBLY & REASSEMBLYCASE EXTENSIONINSPECTION
1999 GMC Forward Control 5.7 R, Automatic
Case Extension: Inspection
1999 GMC Forward Control 5.7 R, AutomaticSECTION Inspection
WARNING: This page does not describe the selected car, but rather 43 other vehicles, including the 2003 Pontiac Montana, 2003 Pontiac Grand Prix, 2003 Pontiac Bonneville, 2003 Pontiac Aztek, and 2003 Oldsmobile Silhouette. However, it is still accessible from the selected car via links, so may be relevant.
Inspect case extension for the following:
- Damaged or porous sealing surface for case extension seal.
- Damaged or porous sealing surface for VSS.
- Damaged or porous sealing surface for right drive shaft oil seal.
- Damaged bolt holes.
- Worn or damaged front differential carrier bushing or output shaft bearing assembly.
- Porous or damaged case extension housing.
Repair as necessary. See Fig 1.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.